Table 1.
Study Sample Demographics at Baseline
| Characteristic | Mean | SE |
|---|---|---|
| Adolescent age at baseline | 11.9 | [0.027] |
| Adolescent age at initiation | 14.8 | [0.051] |
| Characteristic | n | % |
|---|---|---|
| Adolescent gender | ||
| Male | 2962 | 50.5 |
| Female | 2849 | 48.6 |
| Parent race/ethnicity | ||
| Black, non-Hispanic | 788 | 13.4 |
| Hispanic | 743 | 12.7 |
| White, non-Hispanic | 3770 | 64.3 |
| Other | 212 | 3.6 |
| Missing | 351 | 6.0 |
| Family structure (two-parent household) | 3978 | 68.0 |
| Parents’ highest educational level | ||
| 4-year college graduate | 1468 | 25.0 |
| High school graduate but no college degree | 3326 | 56.7 |
| Less than high school/dropout | 680 | 11.6 |
| Missing data | 390 | 6.7 |
| Total annual household income | ||
| $75,000 or more | 1252 | 21.4 |
| $50,000–$74,999 | 1208 | 20.6 |
| $25,000–$49,999 | 1695 | 28.9 |
| Less than $25,000 | 1157 | 19.7 |
| Missing data | 552 | 9.4 |
| Total | 5,864 | 100% |